请根据句意从方框中选择合适的动词,并用其适当时态填空,使句子通顺。
read chat not realize agree operate
We __________ happily when suddenly someone knocked at the door.
Unless you try your best, you__________ your dream.
I __________ this magazine. Will you please show me another one?
Don’t make any noise while the doctors __________ on the patients.
I asked him if he would help me and at last he __________.